Input/Output Module

The input/output module bears a strong resemblance to the SL4000G module, but with a number of enhancements.

The MIC gain is a continuously variable control (from +15dB to +75dB) with a 20dB pad switch. The Mic input can also be switched to high impedance using the HIGH-Z switch, allowing the Mic input to be used for line level signals.

The SL 9000 J Series Dynamics section is based on the classic G Series circuits, with the addition of a Peak detect option on the Compressor (selected by pulling the RATIO switch up) and a HOLD control for the Gate. The Expander/Gate section defaults to Gate, with Expand selected by pulling the HOLD control. As with G Series, the Dynamics section can be keyed from the Monitor path by selecting Insert Return by selecting KEY and IN for the channel insert point.

The Equaliser is a four band parametric, with variable Q on the mid bands and shelving/bell high and low bands. The normal curves of the equaliser are based on the G Series equaliser. The mid bands are constant Q, so the bandwidth increases as the gain is decreased. LF and HF BELL switches are provided as opposed to the LMF and HMF range shift switches found on G Series EQ.

The E switch selects an alternative set of EQ characteristics, based on the classic ‘242’ E Series card. The mid bands have a constant bandwidth, so Q increases as gain is increased; the HF band has a shallower slope than in ‘normal’ mode. The bell curves are identical to the normal ones, ie. without E selected.